<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
</head>
<body>
    <div id="app">
        这个游戏机是：{{price}},含税价格{{price1}}元，折合人民币{{price2}}元。

        <button @click="btnclick(1000)">加价1000</button>
    </div>
    <script>
        var vm = new Vue({
            el:'#app',
            data:{
                price:29980,
                price1:0,
                price2:0
            },
            methods:{
                btnclick(newprice){
                    this.price += newprice;
                }
            },
            watch:{
                price(newval,oldval){
                    this.price1 = this.price*1.08;
                    this.price2 = Math.round(this.price1/16.75);
                }

            }     
        })
    </script>
    
</body>
</html>